The essence of human spirit would seem to be something static to Buddha: if it has an internal imperative to become something else (something higher or more spiritual), what self-disequilibrium could it suffer from that could nonetheless still be considered spiritual in Buddha's eyes? Nietzsche sought to explain this imperative for self-acculturation, for achieving rational self-mastery, for spiritualization, for self-radicalization and self-sublimation, by means of a "Will to Power" far more comprehensive than moderns (with only the cheapest and most facile grasp of "power") can understand. As a philhellene Nietzsche perceives and respects what the Greeks took for granted, that "power" above all else must be self-reflexive, an expression of aristic self-moderation (their anti-hybristic ethos and its correlative contempt for idiotia): "power" to the Greeks is moral and philosophical and cultural and political authority because it expresses itself in the hardest thing of all for humans to achieve, self-mastery.